diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9938505788..104a5e2226 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,17 @@ Please mark all change in change log and use the issue from GitHub
 ## Bug
 -   \#1635 Vectors can be returned by searching after vectors deleted if `cache_insert_data` set true
 
+## Feature
+
+## Improvement
+-   \#1537 Optimize raw vector and uids read/write
+-   \#1546 Move Config.cpp to config directory
+-   \#1547 Rename storage/file to storage/disk and rename classes
+-   \#1548 Move store/Directory to storage/Operation and add FSHandler
+
+## Task
+
+
 # Milvus 0.7.0 (2020-03-11)
 
 ## Bug
@@ -113,9 +124,7 @@ Please mark all change in change log and use the issue from GitHub
 -   \#1448 General proto api for NNS libraries 
 -   \#1480 Add return code for AVX512 selection
 -   \#1524 Update config "preload_table" description
--   \#1537 Optimize raw vector and uids read/write
 -   \#1544 Update resources name in HTTP module
--   \#1546 Move Config.cpp to config directory
 -   \#1567 Update yaml config description
 
 ## Task
diff --git a/core/src/CMakeLists.txt b/core/src/CMakeLists.txt
index 3978a407fd..173e1aa293 100644
--- a/core/src/CMakeLists.txt
+++ b/core/src/CMakeLists.txt
@@ -106,11 +106,11 @@ set(web_server_files
         )
 
 aux_source_directory(${MILVUS_ENGINE_SRC}/storage storage_main_files)
-aux_source_directory(${MILVUS_ENGINE_SRC}/storage/file storage_file_files)
+aux_source_directory(${MILVUS_ENGINE_SRC}/storage/disk storage_disk_files)
 aux_source_directory(${MILVUS_ENGINE_SRC}/storage/s3 storage_s3_files)
 set(storage_files
         ${storage_main_files}
-        ${storage_file_files}
+        ${storage_disk_files}
         ${storage_s3_files}
         )
 
@@ -125,8 +125,6 @@ aux_source_directory(${MILVUS_ENGINE_SRC}/codecs/default codecs_default_files)
 
 aux_source_directory(${MILVUS_ENGINE_SRC}/segment segment_files)
 
-aux_source_directory(${MILVUS_ENGINE_SRC}/store store_files)
-
 set(engine_files
         ${CMAKE_CURRENT_SOURCE_DIR}/main.cpp
         ${cache_files}
@@ -143,7 +141,6 @@ set(engine_files
         ${codecs_files}
         ${codecs_default_files}
         ${segment_files}
-        ${store_files}
         )
 
 if (MILVUS_WITH_PROMETHEUS)
diff --git a/core/src/codecs/DeletedDocsFormat.h b/core/src/codecs/DeletedDocsFormat.h
index d5f263a238..431a9a437a 100644
--- a/core/src/codecs/DeletedDocsFormat.h
+++ b/core/src/codecs/DeletedDocsFormat.h
@@ -20,7 +20,7 @@
 #include <memory>
 
 #include "segment/DeletedDocs.h"
-#include "store/Directory.h"
+#include "storage/FSHandler.h"
 
 namespace milvus {
 namespace codec {
@@ -28,10 +28,10 @@ namespace codec {
 class DeletedDocsFormat {
  public:
     virtual void
-    read(const store::DirectoryPtr& directory_ptr, segment::DeletedDocsPtr& deleted_docs) = 0;
+    read(const storage::FSHandlerPtr& fs_ptr, segment::DeletedDocsPtr& deleted_docs) = 0;
 
     virtual void
-    write(const store::DirectoryPtr& directory_ptr, const segment::DeletedDocsPtr& deleted_docs) = 0;
+    write(const storage::FSHandlerPtr& fs_ptr, const segment::DeletedDocsPtr& deleted_docs) = 0;
 };
 
 using DeletedDocsFormatPtr = std::shared_ptr<DeletedDocsFormat>;
diff --git a/core/src/codecs/IdBloomFilterFormat.h b/core/src/codecs/IdBloomFilterFormat.h
index 11cafac773..a374dd70cb 100644
--- a/core/src/codecs/IdBloomFilterFormat.h
+++ b/core/src/codecs/IdBloomFilterFormat.h
@@ -20,7 +20,7 @@
 #include <memory>
 
 #include "segment/IdBloomFilter.h"
-#include "store/Directory.h"
+#include "storage/FSHandler.h"
 
 namespace milvus {
 namespace codec {
@@ -28,13 +28,13 @@ namespace codec {
 class IdBloomFilterFormat {
  public:
     virtual void
-    read(const store::DirectoryPtr& directory_ptr, segment::IdBloomFilterPtr& id_bloom_filter_ptr) = 0;
+    read(const storage::FSHandlerPtr& fs_ptr, segment::IdBloomFilterPtr& id_bloom_filter_ptr) = 0;
 
     virtual void
-    write(const store::DirectoryPtr& directory_ptr, const segment::IdBloomFilterPtr& id_bloom_filter_ptr) = 0;
+    write(const storage::FSHandlerPtr& fs_ptr, const segment::IdBloomFilterPtr& id_bloom_filter_ptr) = 0;
 
     virtual void
-    create(const store::DirectoryPtr& directory_ptr, segment::IdBloomFilterPtr& id_bloom_filter_ptr) = 0;
+    create(const storage::FSHandlerPtr& fs_ptr, segment::IdBloomFilterPtr& id_bloom_filter_ptr) = 0;
 };
 
 using IdBloomFilterFormatPtr = std::shared_ptr<IdBloomFilterFormat>;
diff --git a/core/src/codecs/VectorsFormat.h b/core/src/codecs/VectorsFormat.h
index cfb7504fd6..5227f9a6a0 100644
--- a/core/src/codecs/VectorsFormat.h
+++ b/core/src/codecs/VectorsFormat.h
@@ -21,7 +21,7 @@
 #include <vector>
 
 #include "segment/Vectors.h"
-#include "store/Directory.h"
+#include "storage/FSHandler.h"
 
 namespace milvus {
 namespace codec {
@@ -29,16 +29,16 @@ namespace codec {
 class VectorsFormat {
  public:
     virtual void
-    read(const store::DirectoryPtr& directory_ptr, segment::VectorsPtr& vectors_read) = 0;
+    read(const storage::FSHandlerPtr& fs_ptr, segment::VectorsPtr& vectors_read) = 0;
 
     virtual void
-    write(const store::DirectoryPtr& directory_ptr, const segment::VectorsPtr& vectors) = 0;
+    write(const storage::FSHandlerPtr& fs_ptr, const segment::VectorsPtr& vectors) = 0;
 
     virtual void
-    read_uids(const store::DirectoryPtr& directory_ptr, std::vector<segment::doc_id_t>& uids) = 0;
+    read_uids(const storage::FSHandlerPtr& fs_ptr, std::vector<segment::doc_id_t>& uids) = 0;
 
     virtual void
-    read_vectors(const store::DirectoryPtr& directory_ptr, off_t offset, size_t num_bytes,
+    read_vectors(const storage::FSHandlerPtr& fs_ptr, off_t offset, size_t num_bytes,
                  std::vector<uint8_t>& raw_vectors) = 0;
 };
 
diff --git a/core/src/codecs/default/DefaultDeletedDocsFormat.cpp b/core/src/codecs/default/DefaultDeletedDocsFormat.cpp
index 0b0039cd4f..128b682543 100644
--- a/core/src/codecs/default/DefaultDeletedDocsFormat.cpp
+++ b/core/src/codecs/default/DefaultDeletedDocsFormat.cpp
@@ -35,10 +35,10 @@ namespace milvus {
 namespace codec {
 
 void
-DefaultDeletedDocsFormat::read(const store::DirectoryPtr& directory_ptr, segment::DeletedDocsPtr& deleted_docs) {
+DefaultDeletedDocsFormat::read(const storage::FSHandlerPtr& fs_ptr, segment::DeletedDocsPtr& deleted_docs) {
     const std::lock_guard<std::mutex> lock(mutex_);
 
-    std::string dir_path = directory_ptr->GetDirPath();
+    std::string dir_path = fs_ptr->operation_ptr_->GetDirectory();
     const std::string del_file_path = dir_path + "/" + deleted_docs_filename_;
 
     int del_fd = open(del_file_path.c_str(), O_RDONLY, 00664);
@@ -75,10 +75,10 @@ DefaultDeletedDocsFormat::read(const store::DirectoryPtr& directory_ptr, segment
 }
 
 void
-DefaultDeletedDocsFormat::write(const store::DirectoryPtr& directory_ptr, const segment::DeletedDocsPtr& deleted_docs) {
+DefaultDeletedDocsFormat::write(const storage::FSHandlerPtr& fs_ptr, const segment::DeletedDocsPtr& deleted_docs) {
     const std::lock_guard<std::mutex> lock(mutex_);
 
-    std::string dir_path = directory_ptr->GetDirPath();
+    std::string dir_path = fs_ptr->operation_ptr_->GetDirectory();
     const std::string del_file_path = dir_path + "/" + deleted_docs_filename_;
 
     // Create a temporary file from the existing file
diff --git a/core/src/codecs/default/DefaultDeletedDocsFormat.h b/core/src/codecs/default/DefaultDeletedDocsFormat.h
index dd58297f35..d755245a84 100644
--- a/core/src/codecs/default/DefaultDeletedDocsFormat.h
+++ b/core/src/codecs/default/DefaultDeletedDocsFormat.h
@@ -30,10 +30,10 @@ class DefaultDeletedDocsFormat : public DeletedDocsFormat {
     DefaultDeletedDocsFormat() = default;
 
     void
-    read(const store::DirectoryPtr& directory_ptr, segment::DeletedDocsPtr& deleted_docs) override;
+    read(const storage::FSHandlerPtr& fs_ptr, segment::DeletedDocsPtr& deleted_docs) override;
 
     void
-    write(const store::DirectoryPtr& directory_ptr, const segment::DeletedDocsPtr& deleted_docs) override;
+    write(const storage::FSHandlerPtr& fs_ptr, const segment::DeletedDocsPtr& deleted_docs) override;
 
     // No copy and move
     DefaultDeletedDocsFormat(const DefaultDeletedDocsFormat&) = delete;
diff --git a/core/src/codecs/default/DefaultIdBloomFilterFormat.cpp b/core/src/codecs/default/DefaultIdBloomFilterFormat.cpp
index 7cbabcfb74..ed7c40908b 100644
--- a/core/src/codecs/default/DefaultIdBloomFilterFormat.cpp
+++ b/core/src/codecs/default/DefaultIdBloomFilterFormat.cpp
@@ -30,11 +30,10 @@ constexpr unsigned int bloom_filter_capacity = 500000;
 constexpr double bloom_filter_error_rate = 0.01;
 
 void
-DefaultIdBloomFilterFormat::read(const store::DirectoryPtr& directory_ptr,
-                                 segment::IdBloomFilterPtr& id_bloom_filter_ptr) {
+DefaultIdBloomFilterFormat::read(const storage::FSHandlerPtr& fs_ptr, segment::IdBloomFilterPtr& id_bloom_filter_ptr) {
     const std::lock_guard<std::mutex> lock(mutex_);
 
-    std::string dir_path = directory_ptr->GetDirPath();
+    std::string dir_path = fs_ptr->operation_ptr_->GetDirectory();
     const std::string bloom_filter_file_path = dir_path + "/" + bloom_filter_filename_;
     scaling_bloom_t* bloom_filter =
         new_scaling_bloom_from_file(bloom_filter_capacity, bloom_filter_error_rate, bloom_filter_file_path.c_str());
@@ -48,11 +47,11 @@ DefaultIdBloomFilterFormat::read(const store::DirectoryPtr& directory_ptr,
 }
 
 void
-DefaultIdBloomFilterFormat::write(const store::DirectoryPtr& directory_ptr,
+DefaultIdBloomFilterFormat::write(const storage::FSHandlerPtr& fs_ptr,
                                   const segment::IdBloomFilterPtr& id_bloom_filter_ptr) {
     const std::lock_guard<std::mutex> lock(mutex_);
 
-    std::string dir_path = directory_ptr->GetDirPath();
+    std::string dir_path = fs_ptr->operation_ptr_->GetDirectory();
     const std::string bloom_filter_file_path = dir_path + "/" + bloom_filter_filename_;
     if (scaling_bloom_flush(id_bloom_filter_ptr->GetBloomFilter()) == -1) {
         std::string err_msg =
@@ -63,9 +62,9 @@ DefaultIdBloomFilterFormat::write(const store::DirectoryPtr& directory_ptr,
 }
 
 void
-DefaultIdBloomFilterFormat::create(const store::DirectoryPtr& directory_ptr,
+DefaultIdBloomFilterFormat::create(const storage::FSHandlerPtr& fs_ptr,
                                    segment::IdBloomFilterPtr& id_bloom_filter_ptr) {
-    std::string dir_path = directory_ptr->GetDirPath();
+    std::string dir_path = fs_ptr->operation_ptr_->GetDirectory();
     const std::string bloom_filter_file_path = dir_path + "/" + bloom_filter_filename_;
     scaling_bloom_t* bloom_filter =
         new_scaling_bloom(bloom_filter_capacity, bloom_filter_error_rate, bloom_filter_file_path.c_str());
diff --git a/core/src/codecs/default/DefaultIdBloomFilterFormat.h b/core/src/codecs/default/DefaultIdBloomFilterFormat.h
index 7a5c4d29fd..e35daad9ef 100644
--- a/core/src/codecs/default/DefaultIdBloomFilterFormat.h
+++ b/core/src/codecs/default/DefaultIdBloomFilterFormat.h
@@ -22,7 +22,7 @@
 
 #include "codecs/IdBloomFilterFormat.h"
 #include "segment/IdBloomFilter.h"
-#include "store/Directory.h"
+#include "storage/disk/DiskOperation.h"
 
 namespace milvus {
 namespace codec {
@@ -32,13 +32,13 @@ class DefaultIdBloomFilterFormat : public IdBloomFilterFormat {
     DefaultIdBloomFilterFormat() = default;
 
     void
-    read(const store::DirectoryPtr& directory_ptr, segment::IdBloomFilterPtr& id_bloom_filter_ptr) override;
+    read(const storage::FSHandlerPtr& fs_ptr, segment::IdBloomFilterPtr& id_bloom_filter_ptr) override;
 
     void
-    write(const store::DirectoryPtr& directory_ptr, const segment::IdBloomFilterPtr& id_bloom_filter_ptr) override;
+    write(const storage::FSHandlerPtr& fs_ptr, const segment::IdBloomFilterPtr& id_bloom_filter_ptr) override;
 
     void
-    create(const store::DirectoryPtr& directory_ptr, segment::IdBloomFilterPtr& id_bloom_filter_ptr) override;
+    create(const storage::FSHandlerPtr& fs_ptr, segment::IdBloomFilterPtr& id_bloom_filter_ptr) override;
 
     // No copy and move
     DefaultIdBloomFilterFormat(const DefaultIdBloomFilterFormat&) = delete;
diff --git a/core/src/codecs/default/DefaultVectorsFormat.cpp b/core/src/codecs/default/DefaultVectorsFormat.cpp
index f32f0ae5ba..412049fc9a 100644
--- a/core/src/codecs/default/DefaultVectorsFormat.cpp
+++ b/core/src/codecs/default/DefaultVectorsFormat.cpp
@@ -102,10 +102,10 @@ DefaultVectorsFormat::read_uids_internal(const std::string& file_path, std::vect
 }
 
 void
-DefaultVectorsFormat::read(const store::DirectoryPtr& directory_ptr, segment::VectorsPtr& vectors_read) {
+DefaultVectorsFormat::read(const storage::FSHandlerPtr& fs_ptr, segment::VectorsPtr& vectors_read) {
     const std::lock_guard<std::mutex> lock(mutex_);
 
-    std::string dir_path = directory_ptr->GetDirPath();
+    std::string dir_path = fs_ptr->operation_ptr_->GetDirectory();
     if (!boost::filesystem::is_directory(dir_path)) {
         std::string err_msg = "Directory: " + dir_path + "does not exist";
         ENGINE_LOG_ERROR << err_msg;
@@ -134,10 +134,10 @@ DefaultVectorsFormat::read(const store::DirectoryPtr& directory_ptr, segment::Ve
 }
 
 void
-DefaultVectorsFormat::write(const store::DirectoryPtr& directory_ptr, const segment::VectorsPtr& vectors) {
+DefaultVectorsFormat::write(const storage::FSHandlerPtr& fs_ptr, const segment::VectorsPtr& vectors) {
     const std::lock_guard<std::mutex> lock(mutex_);
 
-    std::string dir_path = directory_ptr->GetDirPath();
+    std::string dir_path = fs_ptr->operation_ptr_->GetDirectory();
 
     const std::string rv_file_path = dir_path + "/" + vectors->GetName() + raw_vector_extension_;
     const std::string uid_file_path = dir_path + "/" + vectors->GetName() + user_id_extension_;
@@ -197,10 +197,10 @@ DefaultVectorsFormat::write(const store::DirectoryPtr& directory_ptr, const segm
 }
 
 void
-DefaultVectorsFormat::read_uids(const store::DirectoryPtr& directory_ptr, std::vector<segment::doc_id_t>& uids) {
+DefaultVectorsFormat::read_uids(const storage::FSHandlerPtr& fs_ptr, std::vector<segment::doc_id_t>& uids) {
     const std::lock_guard<std::mutex> lock(mutex_);
 
-    std::string dir_path = directory_ptr->GetDirPath();
+    std::string dir_path = fs_ptr->operation_ptr_->GetDirectory();
     if (!boost::filesystem::is_directory(dir_path)) {
         std::string err_msg = "Directory: " + dir_path + "does not exist";
         ENGINE_LOG_ERROR << err_msg;
@@ -221,11 +221,11 @@ DefaultVectorsFormat::read_uids(const store::DirectoryPtr& directory_ptr, std::v
 }
 
 void
-DefaultVectorsFormat::read_vectors(const store::DirectoryPtr& directory_ptr, off_t offset, size_t num_bytes,
+DefaultVectorsFormat::read_vectors(const storage::FSHandlerPtr& fs_ptr, off_t offset, size_t num_bytes,
                                    std::vector<uint8_t>& raw_vectors) {
     const std::lock_guard<std::mutex> lock(mutex_);
 
-    std::string dir_path = directory_ptr->GetDirPath();
+    std::string dir_path = fs_ptr->operation_ptr_->GetDirectory();
     if (!boost::filesystem::is_directory(dir_path)) {
         std::string err_msg = "Directory: " + dir_path + "does not exist";
         ENGINE_LOG_ERROR << err_msg;
diff --git a/core/src/codecs/default/DefaultVectorsFormat.h b/core/src/codecs/default/DefaultVectorsFormat.h
index 54c9b5278d..bfb20f221b 100644
--- a/core/src/codecs/default/DefaultVectorsFormat.h
+++ b/core/src/codecs/default/DefaultVectorsFormat.h
@@ -32,16 +32,17 @@ class DefaultVectorsFormat : public VectorsFormat {
     DefaultVectorsFormat() = default;
 
     void
-    read(const store::DirectoryPtr&, segment::VectorsPtr&) override;
+    read(const storage::FSHandlerPtr& fs_ptr, segment::VectorsPtr& vectors_read) override;
 
     void
-    write(const store::DirectoryPtr&, const segment::VectorsPtr&) override;
+    write(const storage::FSHandlerPtr& fs_ptr, const segment::VectorsPtr& vectors) override;
 
     void
-    read_vectors(const store::DirectoryPtr&, off_t, size_t, std::vector<uint8_t>&) override;
+    read_uids(const storage::FSHandlerPtr& fs_ptr, std::vector<segment::doc_id_t>& uids) override;
 
     void
-    read_uids(const store::DirectoryPtr&, std::vector<segment::doc_id_t>&) override;
+    read_vectors(const storage::FSHandlerPtr& fs_ptr, off_t offset, size_t num_bytes,
+                 std::vector<uint8_t>& raw_vectors) override;
 
     // No copy and move
     DefaultVectorsFormat(const DefaultVectorsFormat&) = delete;
diff --git a/core/src/segment/SegmentReader.cpp b/core/src/segment/SegmentReader.cpp
index c0983a89be..757ed21c56 100644
--- a/core/src/segment/SegmentReader.cpp
+++ b/core/src/segment/SegmentReader.cpp
@@ -21,14 +21,19 @@
 
 #include "Vectors.h"
 #include "codecs/default/DefaultCodec.h"
-#include "store/Directory.h"
+#include "storage/disk/DiskIOReader.h"
+#include "storage/disk/DiskIOWriter.h"
+#include "storage/disk/DiskOperation.h"
 #include "utils/Log.h"
 
 namespace milvus {
 namespace segment {
 
 SegmentReader::SegmentReader(const std::string& directory) {
-    directory_ptr_ = std::make_shared<store::Directory>(directory);
+    storage::IOReaderPtr reader_ptr = std::make_shared<storage::DiskIOReader>();
+    storage::IOWriterPtr writer_ptr = std::make_shared<storage::DiskIOWriter>();
+    storage::OperationPtr operation_ptr = std::make_shared<storage::DiskOperation>(directory);
+    fs_ptr_ = std::make_shared<storage::FSHandler>(reader_ptr, writer_ptr, operation_ptr);
     segment_ptr_ = std::make_shared<Segment>();
 }
 
@@ -43,9 +48,9 @@ SegmentReader::Load() {
     // TODO(zhiru)
     codec::DefaultCodec default_codec;
     try {
-        directory_ptr_->Create();
-        default_codec.GetVectorsFormat()->read(directory_ptr_, segment_ptr_->vectors_ptr_);
-        default_codec.GetDeletedDocsFormat()->read(directory_ptr_, segment_ptr_->deleted_docs_ptr_);
+        fs_ptr_->operation_ptr_->CreateDirectory();
+        default_codec.GetVectorsFormat()->read(fs_ptr_, segment_ptr_->vectors_ptr_);
+        default_codec.GetDeletedDocsFormat()->read(fs_ptr_, segment_ptr_->deleted_docs_ptr_);
     } catch (std::exception& e) {
         return Status(DB_ERROR, e.what());
     }
@@ -56,8 +61,8 @@ Status
 SegmentReader::LoadVectors(off_t offset, size_t num_bytes, std::vector<uint8_t>& raw_vectors) {
     codec::DefaultCodec default_codec;
     try {
-        directory_ptr_->Create();
-        default_codec.GetVectorsFormat()->read_vectors(directory_ptr_, offset, num_bytes, raw_vectors);
+        fs_ptr_->operation_ptr_->CreateDirectory();
+        default_codec.GetVectorsFormat()->read_vectors(fs_ptr_, offset, num_bytes, raw_vectors);
     } catch (std::exception& e) {
         std::string err_msg = "Failed to load raw vectors: " + std::string(e.what());
         ENGINE_LOG_ERROR << err_msg;
@@ -70,8 +75,8 @@ Status
 SegmentReader::LoadUids(std::vector<doc_id_t>& uids) {
     codec::DefaultCodec default_codec;
     try {
-        directory_ptr_->Create();
-        default_codec.GetVectorsFormat()->read_uids(directory_ptr_, uids);
+        fs_ptr_->operation_ptr_->CreateDirectory();
+        default_codec.GetVectorsFormat()->read_uids(fs_ptr_, uids);
     } catch (std::exception& e) {
         std::string err_msg = "Failed to load uids: " + std::string(e.what());
         ENGINE_LOG_ERROR << err_msg;
@@ -90,8 +95,8 @@ Status
 SegmentReader::LoadBloomFilter(segment::IdBloomFilterPtr& id_bloom_filter_ptr) {
     codec::DefaultCodec default_codec;
     try {
-        directory_ptr_->Create();
-        default_codec.GetIdBloomFilterFormat()->read(directory_ptr_, id_bloom_filter_ptr);
+        fs_ptr_->operation_ptr_->CreateDirectory();
+        default_codec.GetIdBloomFilterFormat()->read(fs_ptr_, id_bloom_filter_ptr);
     } catch (std::exception& e) {
         std::string err_msg = "Failed to load bloom filter: " + std::string(e.what());
         ENGINE_LOG_ERROR << err_msg;
@@ -104,8 +109,8 @@ Status
 SegmentReader::LoadDeletedDocs(segment::DeletedDocsPtr& deleted_docs_ptr) {
     codec::DefaultCodec default_codec;
     try {
-        directory_ptr_->Create();
-        default_codec.GetDeletedDocsFormat()->read(directory_ptr_, deleted_docs_ptr);
+        fs_ptr_->operation_ptr_->CreateDirectory();
+        default_codec.GetDeletedDocsFormat()->read(fs_ptr_, deleted_docs_ptr);
     } catch (std::exception& e) {
         std::string err_msg = "Failed to load deleted docs: " + std::string(e.what());
         ENGINE_LOG_ERROR << err_msg;
diff --git a/core/src/segment/SegmentReader.h b/core/src/segment/SegmentReader.h
index 95531d5685..48247e5deb 100644
--- a/core/src/segment/SegmentReader.h
+++ b/core/src/segment/SegmentReader.h
@@ -22,7 +22,7 @@
 #include <vector>
 
 #include "segment/Types.h"
-#include "store/Directory.h"
+#include "storage/FSHandler.h"
 #include "utils/Status.h"
 
 namespace milvus {
@@ -55,7 +55,7 @@ class SegmentReader {
     GetSegment(SegmentPtr& segment_ptr);
 
  private:
-    store::DirectoryPtr directory_ptr_;
+    storage::FSHandlerPtr fs_ptr_;
     SegmentPtr segment_ptr_;
 };
 
diff --git a/core/src/segment/SegmentWriter.cpp b/core/src/segment/SegmentWriter.cpp
index c80776e2f5..2136e229c0 100644
--- a/core/src/segment/SegmentWriter.cpp
+++ b/core/src/segment/SegmentWriter.cpp
@@ -23,14 +23,19 @@
 #include "SegmentReader.h"
 #include "Vectors.h"
 #include "codecs/default/DefaultCodec.h"
-#include "store/Directory.h"
+#include "storage/disk/DiskIOReader.h"
+#include "storage/disk/DiskIOWriter.h"
+#include "storage/disk/DiskOperation.h"
 #include "utils/Log.h"
 
 namespace milvus {
 namespace segment {
 
 SegmentWriter::SegmentWriter(const std::string& directory) {
-    directory_ptr_ = std::make_shared<store::Directory>(directory);
+    storage::IOReaderPtr reader_ptr = std::make_shared<storage::DiskIOReader>();
+    storage::IOWriterPtr writer_ptr = std::make_shared<storage::DiskIOWriter>();
+    storage::OperationPtr operation_ptr = std::make_shared<storage::DiskOperation>(directory);
+    fs_ptr_ = std::make_shared<storage::FSHandler>(reader_ptr, writer_ptr, operation_ptr);
     segment_ptr_ = std::make_shared<Segment>();
 }
 
@@ -84,8 +89,8 @@ Status
 SegmentWriter::WriteVectors() {
     codec::DefaultCodec default_codec;
     try {
-        directory_ptr_->Create();
-        default_codec.GetVectorsFormat()->write(directory_ptr_, segment_ptr_->vectors_ptr_);
+        fs_ptr_->operation_ptr_->CreateDirectory();
+        default_codec.GetVectorsFormat()->write(fs_ptr_, segment_ptr_->vectors_ptr_);
     } catch (std::exception& e) {
         std::string err_msg = "Failed to write vectors: " + std::string(e.what());
         ENGINE_LOG_ERROR << err_msg;
@@ -98,11 +103,11 @@ Status
 SegmentWriter::WriteBloomFilter() {
     codec::DefaultCodec default_codec;
     try {
-        directory_ptr_->Create();
+        fs_ptr_->operation_ptr_->CreateDirectory();
 
         auto start = std::chrono::high_resolution_clock::now();
 
-        default_codec.GetIdBloomFilterFormat()->create(directory_ptr_, segment_ptr_->id_bloom_filter_ptr_);
+        default_codec.GetIdBloomFilterFormat()->create(fs_ptr_, segment_ptr_->id_bloom_filter_ptr_);
 
         auto end = std::chrono::high_resolution_clock::now();
         std::chrono::duration<double> diff = end - start;
@@ -121,7 +126,7 @@ SegmentWriter::WriteBloomFilter() {
 
         start = std::chrono::high_resolution_clock::now();
 
-        default_codec.GetIdBloomFilterFormat()->write(directory_ptr_, segment_ptr_->id_bloom_filter_ptr_);
+        default_codec.GetIdBloomFilterFormat()->write(fs_ptr_, segment_ptr_->id_bloom_filter_ptr_);
 
         end = std::chrono::high_resolution_clock::now();
         diff = end - start;
@@ -138,9 +143,9 @@ Status
 SegmentWriter::WriteDeletedDocs() {
     codec::DefaultCodec default_codec;
     try {
-        directory_ptr_->Create();
+        fs_ptr_->operation_ptr_->CreateDirectory();
         DeletedDocsPtr deleted_docs_ptr = std::make_shared<DeletedDocs>();
-        default_codec.GetDeletedDocsFormat()->write(directory_ptr_, deleted_docs_ptr);
+        default_codec.GetDeletedDocsFormat()->write(fs_ptr_, deleted_docs_ptr);
     } catch (std::exception& e) {
         std::string err_msg = "Failed to write deleted docs: " + std::string(e.what());
         ENGINE_LOG_ERROR << err_msg;
@@ -153,8 +158,8 @@ Status
 SegmentWriter::WriteDeletedDocs(const DeletedDocsPtr& deleted_docs) {
     codec::DefaultCodec default_codec;
     try {
-        directory_ptr_->Create();
-        default_codec.GetDeletedDocsFormat()->write(directory_ptr_, deleted_docs);
+        fs_ptr_->operation_ptr_->CreateDirectory();
+        default_codec.GetDeletedDocsFormat()->write(fs_ptr_, deleted_docs);
     } catch (std::exception& e) {
         std::string err_msg = "Failed to write deleted docs: " + std::string(e.what());
         ENGINE_LOG_ERROR << err_msg;
@@ -167,8 +172,8 @@ Status
 SegmentWriter::WriteBloomFilter(const IdBloomFilterPtr& id_bloom_filter_ptr) {
     codec::DefaultCodec default_codec;
     try {
-        directory_ptr_->Create();
-        default_codec.GetIdBloomFilterFormat()->write(directory_ptr_, id_bloom_filter_ptr);
+        fs_ptr_->operation_ptr_->CreateDirectory();
+        default_codec.GetIdBloomFilterFormat()->write(fs_ptr_, id_bloom_filter_ptr);
     } catch (std::exception& e) {
         std::string err_msg = "Failed to write bloom filter: " + std::string(e.what());
         ENGINE_LOG_ERROR << err_msg;
@@ -191,11 +196,11 @@ SegmentWriter::GetSegment(SegmentPtr& segment_ptr) {
 
 Status
 SegmentWriter::Merge(const std::string& dir_to_merge, const std::string& name) {
-    if (dir_to_merge == directory_ptr_->GetDirPath()) {
+    if (dir_to_merge == fs_ptr_->operation_ptr_->GetDirectory()) {
         return Status(DB_ERROR, "Cannot Merge Self");
     }
 
-    ENGINE_LOG_DEBUG << "Merging from " << dir_to_merge << " to " << directory_ptr_->GetDirPath();
+    ENGINE_LOG_DEBUG << "Merging from " << dir_to_merge << " to " << fs_ptr_->operation_ptr_->GetDirectory();
 
     auto start = std::chrono::high_resolution_clock::now();
 
@@ -234,7 +239,7 @@ SegmentWriter::Merge(const std::string& dir_to_merge, const std::string& name) {
     ENGINE_LOG_DEBUG << "Adding " << segment_to_merge->vectors_ptr_->GetCount() << " vectors and uids took "
                      << diff.count() << " s";
 
-    ENGINE_LOG_DEBUG << "Merging completed from " << dir_to_merge << " to " << directory_ptr_->GetDirPath();
+    ENGINE_LOG_DEBUG << "Merging completed from " << dir_to_merge << " to " << fs_ptr_->operation_ptr_->GetDirectory();
 
     return Status::OK();
 }
diff --git a/core/src/segment/SegmentWriter.h b/core/src/segment/SegmentWriter.h
index f7b6a7398c..b5d42761a1 100644
--- a/core/src/segment/SegmentWriter.h
+++ b/core/src/segment/SegmentWriter.h
@@ -22,7 +22,7 @@
 #include <vector>
 
 #include "segment/Types.h"
-#include "store/Directory.h"
+#include "storage/FSHandler.h"
 #include "utils/Status.h"
 
 namespace milvus {
@@ -70,7 +70,7 @@ class SegmentWriter {
     WriteDeletedDocs();
 
  private:
-    store::DirectoryPtr directory_ptr_;
+    storage::FSHandlerPtr fs_ptr_;
     SegmentPtr segment_ptr_;
 };
 
diff --git a/core/src/storage/FSHandler.h b/core/src/storage/FSHandler.h
new file mode 100644
index 0000000000..8b0f175bf9
--- /dev/null
+++ b/core/src/storage/FSHandler.h
@@ -0,0 +1,42 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#pragma once
+
+#include <memory>
+
+#include "storage/IOReader.h"
+#include "storage/IOWriter.h"
+#include "storage/Operation.h"
+
+namespace milvus {
+namespace storage {
+
+struct FSHandler {
+    IOReaderPtr reader_ptr_ = nullptr;
+    IOWriterPtr writer_ptr_ = nullptr;
+    OperationPtr operation_ptr_ = nullptr;
+
+    FSHandler(IOReaderPtr& reader_ptr, IOWriterPtr& writer_ptr, OperationPtr& operation_ptr)
+        : reader_ptr_(reader_ptr), writer_ptr_(writer_ptr), operation_ptr_(operation_ptr) {
+    }
+};
+
+using FSHandlerPtr = std::shared_ptr<FSHandler>;
+
+}  // namespace storage
+}  // namespace milvus
diff --git a/core/src/storage/IOReader.h b/core/src/storage/IOReader.h
index 0116602a08..eeddb7438b 100644
--- a/core/src/storage/IOReader.h
+++ b/core/src/storage/IOReader.h
@@ -11,6 +11,7 @@
 
 #pragma once
 
+#include <memory>
 #include <string>
 
 namespace milvus {
@@ -18,9 +19,8 @@ namespace storage {
 
 class IOReader {
  public:
-    explicit IOReader(const std::string& name) : name_(name) {
-    }
-    ~IOReader() = default;
+    virtual void
+    open(const std::string& name) = 0;
 
     virtual void
     read(void* ptr, size_t size) = 0;
@@ -31,9 +31,11 @@ class IOReader {
     virtual size_t
     length() = 0;
 
- public:
-    std::string name_;
+    virtual void
+    close() = 0;
 };
 
+using IOReaderPtr = std::shared_ptr<IOReader>;
+
 }  // namespace storage
 }  // namespace milvus
diff --git a/core/src/storage/IOWriter.h b/core/src/storage/IOWriter.h
index a2281a02bd..38b6887057 100644
--- a/core/src/storage/IOWriter.h
+++ b/core/src/storage/IOWriter.h
@@ -11,6 +11,7 @@
 
 #pragma once
 
+#include <memory>
 #include <string>
 
 namespace milvus {
@@ -18,9 +19,8 @@ namespace storage {
 
 class IOWriter {
  public:
-    explicit IOWriter(const std::string& name) : name_(name), len_(0) {
-    }
-    ~IOWriter() = default;
+    virtual void
+    open(const std::string& name) = 0;
 
     virtual void
     write(void* ptr, size_t size) = 0;
@@ -28,10 +28,11 @@ class IOWriter {
     virtual size_t
     length() = 0;
 
- public:
-    std::string name_;
-    size_t len_;
+    virtual void
+    close() = 0;
 };
 
+using IOWriterPtr = std::shared_ptr<IOWriter>;
+
 }  // namespace storage
 }  // namespace milvus
diff --git a/core/src/storage/IStorage.h b/core/src/storage/IStorage.h
deleted file mode 100644
index 6839f2bfca..0000000000
--- a/core/src/storage/IStorage.h
+++ /dev/null
@@ -1,44 +0,0 @@
-// Copyright (C) 2019-2020 Zilliz. All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
-// with the License. You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software distributed under the License
-// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
-// or implied. See the License for the specific language governing permissions and limitations under the License.
-
-#pragma once
-
-#include <string>
-#include <vector>
-#include "utils/Status.h"
-
-namespace milvus {
-namespace storage {
-
-class IStorage {
- public:
-    virtual Status
-    CreateBucket() = 0;
-    virtual Status
-    DeleteBucket() = 0;
-    virtual Status
-    PutObjectFile(const std::string& object_name, const std::string& file_path) = 0;
-    virtual Status
-    PutObjectStr(const std::string& object_name, const std::string& content) = 0;
-    virtual Status
-    GetObjectFile(const std::string& object_name, const std::string& file_path) = 0;
-    virtual Status
-    GetObjectStr(const std::string& object_name, std::string& content) = 0;
-    virtual Status
-    ListObjects(std::vector<std::string>& object_list, const std::string& marker = "") = 0;
-    virtual Status
-    DeleteObject(const std::string& object_name) = 0;
-    virtual Status
-    DeleteObjects(const std::string& marker) = 0;
-};
-
-}  // namespace storage
-}  // namespace milvus
diff --git a/core/src/storage/Operation.h b/core/src/storage/Operation.h
new file mode 100644
index 0000000000..a29069c7da
--- /dev/null
+++ b/core/src/storage/Operation.h
@@ -0,0 +1,51 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#pragma once
+
+#include <memory>
+#include <string>
+#include <vector>
+
+namespace milvus {
+namespace storage {
+
+class Operation {
+ public:
+    virtual void
+    CreateDirectory() = 0;
+
+    virtual const std::string&
+    GetDirectory() const = 0;
+
+    virtual void
+    ListDirectory(std::vector<std::string>& file_paths) = 0;
+
+    virtual bool
+    DeleteFile(const std::string& file_path) = 0;
+
+    // TODO(zhiru):
+    //  open(), sync(), close()
+    //  function that opens a stream for reading file
+    //  function that creates a new, empty file and returns an stream for appending data to this file
+    //  function that creates a new, empty, temporary file and returns an stream for appending data to this file
+};
+
+using OperationPtr = std::shared_ptr<Operation>;
+
+}  // namespace storage
+}  // namespace milvus
diff --git a/core/src/storage/file/FileIOReader.cpp b/core/src/storage/disk/DiskIOReader.cpp
similarity index 74%
rename from core/src/storage/file/FileIOReader.cpp
rename to core/src/storage/disk/DiskIOReader.cpp
index 9aab29e344..f51ffef0b3 100644
--- a/core/src/storage/file/FileIOReader.cpp
+++ b/core/src/storage/disk/DiskIOReader.cpp
@@ -9,33 +9,39 @@
 // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 // or implied. See the License for the specific language governing permissions and limitations under the License.
 
-#include "storage/file/FileIOReader.h"
+#include "storage/disk/DiskIOReader.h"
 
 namespace milvus {
 namespace storage {
 
-FileIOReader::FileIOReader(const std::string& name) : IOReader(name) {
+void
+DiskIOReader::open(const std::string& name) {
+    name_ = name;
     fs_ = std::fstream(name_, std::ios::in | std::ios::binary);
 }
 
-FileIOReader::~FileIOReader() {
-    fs_.close();
-}
-
 void
-FileIOReader::read(void* ptr, size_t size) {
+DiskIOReader::read(void* ptr, size_t size) {
     fs_.read(reinterpret_cast<char*>(ptr), size);
 }
 
 void
-FileIOReader::seekg(size_t pos) {
+DiskIOReader::seekg(size_t pos) {
     fs_.seekg(pos);
 }
 
 size_t
-FileIOReader::length() {
+DiskIOReader::length() {
     fs_.seekg(0, fs_.end);
-    return fs_.tellg();
+    size_t len = fs_.tellg();
+    fs_.seekg(0, fs_.beg);
+    return len;
 }
+
+void
+DiskIOReader::close() {
+    fs_.close();
+}
+
 }  // namespace storage
 }  // namespace milvus
diff --git a/core/src/storage/file/FileIOReader.h b/core/src/storage/disk/DiskIOReader.h
similarity index 67%
rename from core/src/storage/file/FileIOReader.h
rename to core/src/storage/disk/DiskIOReader.h
index ed35c39d6c..2fcf52457d 100644
--- a/core/src/storage/file/FileIOReader.h
+++ b/core/src/storage/disk/DiskIOReader.h
@@ -18,10 +18,22 @@
 namespace milvus {
 namespace storage {
 
-class FileIOReader : public IOReader {
+class DiskIOReader : public IOReader {
  public:
-    explicit FileIOReader(const std::string& name);
-    ~FileIOReader();
+    DiskIOReader() = default;
+    ~DiskIOReader() = default;
+
+    // No copy and move
+    DiskIOReader(const DiskIOReader&) = delete;
+    DiskIOReader(DiskIOReader&&) = delete;
+
+    DiskIOReader&
+    operator=(const DiskIOReader&) = delete;
+    DiskIOReader&
+    operator=(DiskIOReader&&) = delete;
+
+    void
+    open(const std::string& name) override;
 
     void
     read(void* ptr, size_t size) override;
@@ -32,7 +44,11 @@ class FileIOReader : public IOReader {
     size_t
     length() override;
 
+    void
+    close() override;
+
  public:
+    std::string name_;
     std::fstream fs_;
 };
 
diff --git a/core/src/storage/file/FileIOWriter.cpp b/core/src/storage/disk/DiskIOWriter.cpp
similarity index 79%
rename from core/src/storage/file/FileIOWriter.cpp
rename to core/src/storage/disk/DiskIOWriter.cpp
index 3992b58369..63899463b1 100644
--- a/core/src/storage/file/FileIOWriter.cpp
+++ b/core/src/storage/disk/DiskIOWriter.cpp
@@ -9,29 +9,33 @@
 // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 // or implied. See the License for the specific language governing permissions and limitations under the License.
 
-#include "storage/file/FileIOWriter.h"
+#include "storage/disk/DiskIOWriter.h"
 
 namespace milvus {
 namespace storage {
 
-FileIOWriter::FileIOWriter(const std::string& name) : IOWriter(name) {
+void
+DiskIOWriter::open(const std::string& name) {
+    name_ = name;
+    len_ = 0;
     fs_ = std::fstream(name_, std::ios::out | std::ios::binary);
 }
 
-FileIOWriter::~FileIOWriter() {
-    fs_.close();
-}
-
 void
-FileIOWriter::write(void* ptr, size_t size) {
+DiskIOWriter::write(void* ptr, size_t size) {
     fs_.write(reinterpret_cast<char*>(ptr), size);
     len_ += size;
 }
 
 size_t
-FileIOWriter::length() {
+DiskIOWriter::length() {
     return len_;
 }
 
+void
+DiskIOWriter::close() {
+    fs_.close();
+}
+
 }  // namespace storage
 }  // namespace milvus
diff --git a/core/src/storage/file/FileIOWriter.h b/core/src/storage/disk/DiskIOWriter.h
similarity index 66%
rename from core/src/storage/file/FileIOWriter.h
rename to core/src/storage/disk/DiskIOWriter.h
index b06eb3feca..39c9b5ca68 100644
--- a/core/src/storage/file/FileIOWriter.h
+++ b/core/src/storage/disk/DiskIOWriter.h
@@ -18,10 +18,22 @@
 namespace milvus {
 namespace storage {
 
-class FileIOWriter : public IOWriter {
+class DiskIOWriter : public IOWriter {
  public:
-    explicit FileIOWriter(const std::string& name);
-    ~FileIOWriter();
+    DiskIOWriter() = default;
+    ~DiskIOWriter() = default;
+
+    // No copy and move
+    DiskIOWriter(const DiskIOWriter&) = delete;
+    DiskIOWriter(DiskIOWriter&&) = delete;
+
+    DiskIOWriter&
+    operator=(const DiskIOWriter&) = delete;
+    DiskIOWriter&
+    operator=(DiskIOWriter&&) = delete;
+
+    void
+    open(const std::string& name) override;
 
     void
     write(void* ptr, size_t size) override;
@@ -29,7 +41,12 @@ class FileIOWriter : public IOWriter {
     size_t
     length() override;
 
+    void
+    close() override;
+
  public:
+    std::string name_;
+    size_t len_;
     std::fstream fs_;
 };
 
diff --git a/core/src/store/Directory.cpp b/core/src/storage/disk/DiskOperation.cpp
similarity index 82%
rename from core/src/store/Directory.cpp
rename to core/src/storage/disk/DiskOperation.cpp
index 1d41da004f..90a36c2bb2 100644
--- a/core/src/store/Directory.cpp
+++ b/core/src/storage/disk/DiskOperation.cpp
@@ -15,21 +15,20 @@
 // specific language governing permissions and limitations
 // under the License.
 
-#include "store/Directory.h"
-
 #include <boost/filesystem.hpp>
 
+#include "storage/disk/DiskOperation.h"
 #include "utils/Exception.h"
 #include "utils/Log.h"
 
 namespace milvus {
-namespace store {
+namespace storage {
 
-Directory::Directory(const std::string& dir_path) : dir_path_(dir_path) {
+DiskOperation::DiskOperation(const std::string& dir_path) : dir_path_(dir_path) {
 }
 
 void
-Directory::Create() {
+DiskOperation::CreateDirectory() {
     if (!boost::filesystem::is_directory(dir_path_)) {
         auto ret = boost::filesystem::create_directory(dir_path_);
         if (!ret) {
@@ -40,8 +39,13 @@ Directory::Create() {
     }
 }
 
+const std::string&
+DiskOperation::GetDirectory() const {
+    return dir_path_;
+}
+
 void
-Directory::ListAll(std::vector<std::string>& file_paths) {
+DiskOperation::ListDirectory(std::vector<std::string>& file_paths) {
     boost::filesystem::path target_path(dir_path_);
     typedef boost::filesystem::directory_iterator d_it;
     d_it it_end;
@@ -54,14 +58,9 @@ Directory::ListAll(std::vector<std::string>& file_paths) {
 }
 
 bool
-Directory::DeleteFile(const std::string& file_path) {
+DiskOperation::DeleteFile(const std::string& file_path) {
     return boost::filesystem::remove(file_path);
 }
 
-const std::string&
-Directory::GetDirPath() const {
-    return dir_path_;
-}
-
-}  // namespace store
+}  // namespace storage
 }  // namespace milvus
diff --git a/core/src/store/Directory.h b/core/src/storage/disk/DiskOperation.h
similarity index 80%
rename from core/src/store/Directory.h
rename to core/src/storage/disk/DiskOperation.h
index de1dc276ac..50c1a4ba3d 100644
--- a/core/src/store/Directory.h
+++ b/core/src/storage/disk/DiskOperation.h
@@ -21,25 +21,27 @@
 #include <string>
 #include <vector>
 
+#include "storage/Operation.h"
+
 namespace milvus {
-namespace store {
+namespace storage {
 
-class Directory {
+class DiskOperation : public Operation {
  public:
-    explicit Directory(const std::string& dir_path);
+    explicit DiskOperation(const std::string& dir_path);
 
     void
-    Create();
+    CreateDirectory();
+
+    const std::string&
+    GetDirectory() const;
 
     void
-    ListAll(std::vector<std::string>& file_paths);
+    ListDirectory(std::vector<std::string>& file_paths);
 
     bool
     DeleteFile(const std::string& file_path);
 
-    const std::string&
-    GetDirPath() const;
-
     // TODO(zhiru):
     //  open(), sync(), close()
     //  function that opens a stream for reading file
@@ -50,7 +52,7 @@ class Directory {
     const std::string dir_path_;
 };
 
-using DirectoryPtr = std::shared_ptr<Directory>;
+using DiskOperationPtr = std::shared_ptr<DiskOperation>;
 
-}  // namespace store
+}  // namespace storage
 }  // namespace milvus
diff --git a/core/src/storage/s3/S3ClientWrapper.h b/core/src/storage/s3/S3ClientWrapper.h
index 452c5cc2e7..f0e2d8cfe7 100644
--- a/core/src/storage/s3/S3ClientWrapper.h
+++ b/core/src/storage/s3/S3ClientWrapper.h
@@ -16,12 +16,13 @@
 #include <memory>
 #include <string>
 #include <vector>
-#include "storage/IStorage.h"
+
+#include "utils/Status.h"
 
 namespace milvus {
 namespace storage {
 
-class S3ClientWrapper : public IStorage {
+class S3ClientWrapper {
  public:
     static S3ClientWrapper&
     GetInstance() {
@@ -35,23 +36,23 @@ class S3ClientWrapper : public IStorage {
     StopService();
 
     Status
-    CreateBucket() override;
+    CreateBucket();
     Status
-    DeleteBucket() override;
+    DeleteBucket();
     Status
-    PutObjectFile(const std::string& object_key, const std::string& file_path) override;
+    PutObjectFile(const std::string& object_key, const std::string& file_path);
     Status
-    PutObjectStr(const std::string& object_key, const std::string& content) override;
+    PutObjectStr(const std::string& object_key, const std::string& content);
     Status
-    GetObjectFile(const std::string& object_key, const std::string& file_path) override;
+    GetObjectFile(const std::string& object_key, const std::string& file_path);
     Status
-    GetObjectStr(const std::string& object_key, std::string& content) override;
+    GetObjectStr(const std::string& object_key, std::string& content);
     Status
-    ListObjects(std::vector<std::string>& object_list, const std::string& marker = "") override;
+    ListObjects(std::vector<std::string>& object_list, const std::string& marker = "");
     Status
-    DeleteObject(const std::string& object_key) override;
+    DeleteObject(const std::string& object_key);
     Status
-    DeleteObjects(const std::string& marker) override;
+    DeleteObjects(const std::string& marker);
 
  private:
     std::shared_ptr<Aws::S3::S3Client> client_ptr_;
diff --git a/core/src/storage/s3/S3IOReader.cpp b/core/src/storage/s3/S3IOReader.cpp
index 77edcb3861..e8d073029a 100644
--- a/core/src/storage/s3/S3IOReader.cpp
+++ b/core/src/storage/s3/S3IOReader.cpp
@@ -15,13 +15,13 @@
 namespace milvus {
 namespace storage {
 
-S3IOReader::S3IOReader(const std::string& name) : IOReader(name), pos_(0) {
+void
+S3IOReader::open(const std::string& name) {
+    name_ = name;
+    pos_ = 0;
     S3ClientWrapper::GetInstance().GetObjectStr(name_, buffer_);
 }
 
-S3IOReader::~S3IOReader() {
-}
-
 void
 S3IOReader::read(void* ptr, size_t size) {
     memcpy(ptr, buffer_.data() + pos_, size);
@@ -37,5 +37,9 @@ S3IOReader::length() {
     return buffer_.length();
 }
 
+void
+S3IOReader::close() {
+}
+
 }  // namespace storage
 }  // namespace milvus
diff --git a/core/src/storage/s3/S3IOReader.h b/core/src/storage/s3/S3IOReader.h
index 5c2529c8e9..e69a64f969 100644
--- a/core/src/storage/s3/S3IOReader.h
+++ b/core/src/storage/s3/S3IOReader.h
@@ -19,8 +19,20 @@ namespace storage {
 
 class S3IOReader : public IOReader {
  public:
-    explicit S3IOReader(const std::string& name);
-    ~S3IOReader();
+    S3IOReader() = default;
+    ~S3IOReader() = default;
+
+    // No copy and move
+    S3IOReader(const S3IOReader&) = delete;
+    S3IOReader(S3IOReader&&) = delete;
+
+    S3IOReader&
+    operator=(const S3IOReader&) = delete;
+    S3IOReader&
+    operator=(S3IOReader&&) = delete;
+
+    void
+    open(const std::string& name) override;
 
     void
     read(void* ptr, size_t size) override;
@@ -31,7 +43,11 @@ class S3IOReader : public IOReader {
     size_t
     length() override;
 
+    void
+    close() override;
+
  public:
+    std::string name_;
     std::string buffer_;
     size_t pos_;
 };
diff --git a/core/src/storage/s3/S3IOWriter.cpp b/core/src/storage/s3/S3IOWriter.cpp
index 51fff830fe..9d00db3c83 100644
--- a/core/src/storage/s3/S3IOWriter.cpp
+++ b/core/src/storage/s3/S3IOWriter.cpp
@@ -15,14 +15,13 @@
 namespace milvus {
 namespace storage {
 
-S3IOWriter::S3IOWriter(const std::string& name) : IOWriter(name) {
+void
+S3IOWriter::open(const std::string& name) {
+    name_ = name;
+    len_ = 0;
     buffer_ = "";
 }
 
-S3IOWriter::~S3IOWriter() {
-    S3ClientWrapper::GetInstance().PutObjectStr(name_, buffer_);
-}
-
 void
 S3IOWriter::write(void* ptr, size_t size) {
     buffer_ += std::string(reinterpret_cast<char*>(ptr), size);
@@ -34,5 +33,10 @@ S3IOWriter::length() {
     return len_;
 }
 
+void
+S3IOWriter::close() {
+    S3ClientWrapper::GetInstance().PutObjectStr(name_, buffer_);
+}
+
 }  // namespace storage
 }  // namespace milvus
diff --git a/core/src/storage/s3/S3IOWriter.h b/core/src/storage/s3/S3IOWriter.h
index 53ec345afe..0b5240d7b1 100644
--- a/core/src/storage/s3/S3IOWriter.h
+++ b/core/src/storage/s3/S3IOWriter.h
@@ -19,8 +19,20 @@ namespace storage {
 
 class S3IOWriter : public IOWriter {
  public:
-    explicit S3IOWriter(const std::string& name);
-    ~S3IOWriter();
+    S3IOWriter() = default;
+    ~S3IOWriter() = default;
+
+    // No copy and move
+    S3IOWriter(const S3IOWriter&) = delete;
+    S3IOWriter(S3IOWriter&&) = delete;
+
+    S3IOWriter&
+    operator=(const S3IOWriter&) = delete;
+    S3IOWriter&
+    operator=(S3IOWriter&&) = delete;
+
+    void
+    open(const std::string& name) override;
 
     void
     write(void* ptr, size_t size) override;
@@ -28,7 +40,12 @@ class S3IOWriter : public IOWriter {
     size_t
     length() override;
 
+    void
+    close() override;
+
  public:
+    std::string name_;
+    size_t len_;
     std::string buffer_;
 };
 
diff --git a/core/src/wrapper/VecIndex.cpp b/core/src/wrapper/VecIndex.cpp
index 142b1e1d49..a81dfe52e8 100644
--- a/core/src/wrapper/VecIndex.cpp
+++ b/core/src/wrapper/VecIndex.cpp
@@ -22,8 +22,8 @@
 #include "knowhere/index/vector_index/IndexIVFSQ.h"
 #include "knowhere/index/vector_index/IndexNSG.h"
 #include "knowhere/index/vector_index/IndexSPTAG.h"
-#include "storage/file/FileIOReader.h"
-#include "storage/file/FileIOWriter.h"
+#include "storage/disk/DiskIOReader.h"
+#include "storage/disk/DiskIOWriter.h"
 #include "storage/s3/S3IOReader.h"
 #include "storage/s3/S3IOWriter.h"
 #include "utils/Exception.h"
@@ -179,12 +179,13 @@ read_index(const std::string& location) {
 
     std::shared_ptr<storage::IOReader> reader_ptr;
     if (s3_enable) {
-        reader_ptr = std::make_shared<storage::S3IOReader>(location);
+        reader_ptr = std::make_shared<storage::S3IOReader>();
     } else {
-        reader_ptr = std::make_shared<storage::FileIOReader>(location);
+        reader_ptr = std::make_shared<storage::DiskIOReader>();
     }
 
     recorder.RecordSection("Start");
+    reader_ptr->open(location);
 
     size_t length = reader_ptr->length();
     if (length <= 0) {
@@ -226,6 +227,8 @@ read_index(const std::string& location) {
         delete[] meta;
     }
 
+    reader_ptr->close();
+
     double span = recorder.RecordSection("End");
     double rate = length * 1000000.0 / span / 1024 / 1024;
     STORAGE_LOG_DEBUG << "read_index(" << location << ") rate " << rate << "MB/s";
@@ -252,12 +255,13 @@ write_index(VecIndexPtr index, const std::string& location) {
 
         std::shared_ptr<storage::IOWriter> writer_ptr;
         if (s3_enable) {
-            writer_ptr = std::make_shared<storage::S3IOWriter>(location);
+            writer_ptr = std::make_shared<storage::S3IOWriter>();
         } else {
-            writer_ptr = std::make_shared<storage::FileIOWriter>(location);
+            writer_ptr = std::make_shared<storage::DiskIOWriter>();
         }
 
         recorder.RecordSection("Start");
+        writer_ptr->open(location);
 
         writer_ptr->write(&index_type, sizeof(IndexType));
 
@@ -273,6 +277,8 @@ write_index(VecIndexPtr index, const std::string& location) {
             writer_ptr->write((void*)binary->data.get(), binary_length);
         }
 
+        writer_ptr->close();
+
         double span = recorder.RecordSection("End");
         double rate = writer_ptr->length() * 1000000.0 / span / 1024 / 1024;
         STORAGE_LOG_DEBUG << "write_index(" << location << ") rate " << rate << "MB/s";
diff --git a/core/unittest/CMakeLists.txt b/core/unittest/CMakeLists.txt
index 8d41b731fe..6674fdf032 100644
--- a/core/unittest/CMakeLists.txt
+++ b/core/unittest/CMakeLists.txt
@@ -98,11 +98,11 @@ aux_source_directory(${MILVUS_ENGINE_SRC}/wrapper wrapper_files)
 aux_source_directory(${MILVUS_ENGINE_SRC}/tracing tracing_files)
 
 aux_source_directory(${MILVUS_ENGINE_SRC}/storage storage_main_files)
-aux_source_directory(${MILVUS_ENGINE_SRC}/storage/file storage_file_files)
+aux_source_directory(${MILVUS_ENGINE_SRC}/storage/disk storage_disk_files)
 aux_source_directory(${MILVUS_ENGINE_SRC}/storage/s3 storage_s3_files)
 set(storage_files
         ${storage_main_files}
-        ${storage_file_files}
+        ${storage_disk_files}
         ${storage_s3_files}
         )
 
@@ -111,8 +111,6 @@ aux_source_directory(${MILVUS_ENGINE_SRC}/codecs/default codecs_default_files)
 
 aux_source_directory(${MILVUS_ENGINE_SRC}/segment segment_files)
 
-aux_source_directory(${MILVUS_ENGINE_SRC}/store store_files)
-
 set(entry_file
         ${CMAKE_CURRENT_SOURCE_DIR}/main.cpp)
 
@@ -146,7 +144,6 @@ set(common_files
         ${codecs_files}
         ${codecs_default_files}
         ${segment_files}
-        ${store_files}
         )
 
 set(unittest_libs
diff --git a/core/unittest/storage/test_s3_client.cpp b/core/unittest/storage/test_s3_client.cpp
index 1b326d57a7..e868b9d0a5 100644
--- a/core/unittest/storage/test_s3_client.cpp
+++ b/core/unittest/storage/test_s3_client.cpp
@@ -21,7 +21,6 @@
 #include "storage/s3/S3ClientWrapper.h"
 #include "storage/s3/S3IOReader.h"
 #include "storage/s3/S3IOWriter.h"
-#include "storage/IStorage.h"
 #include "storage/utils.h"
 
 INITIALIZE_EASYLOGGINGPP
@@ -91,15 +90,18 @@ TEST_F(StorageTest, S3_RW_TEST) {
     ASSERT_TRUE(storage_inst.StartService().ok());
 
     {
-        milvus::storage::S3IOWriter writer(index_name);
+        milvus::storage::S3IOWriter writer;
+        writer.open(index_name);
         size_t len = content.length();
         writer.write(&len, sizeof(len));
         writer.write((void*)(content.data()), len);
         ASSERT_TRUE(len + sizeof(len) == writer.length());
+        writer.close();
     }
 
     {
-        milvus::storage::S3IOReader reader(index_name);
+        milvus::storage::S3IOReader reader;
+        reader.open(index_name);
         size_t length = reader.length();
         size_t rp = 0;
         reader.seekg(rp);
@@ -121,6 +123,7 @@ TEST_F(StorageTest, S3_RW_TEST) {
         }
 
         ASSERT_TRUE(content == content_out);
+        reader.close();
     }
 
     storage_inst.StopService();
diff --git a/core/unittest/wrapper/CMakeLists.txt b/core/unittest/wrapper/CMakeLists.txt
index 7cf4846610..487477f3da 100644
--- a/core/unittest/wrapper/CMakeLists.txt
+++ b/core/unittest/wrapper/CMakeLists.txt
@@ -27,8 +27,8 @@ set(wrapper_files
         )
 
 set(storage_files
-        ${MILVUS_ENGINE_SRC}/storage/file/FileIOReader.cpp
-        ${MILVUS_ENGINE_SRC}/storage/file/FileIOWriter.cpp
+        ${MILVUS_ENGINE_SRC}/storage/disk/DiskIOReader.cpp
+        ${MILVUS_ENGINE_SRC}/storage/disk/DiskIOWriter.cpp
         )
 
 set(util_files